Sökning: "Torbjörn eriksson"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden Torbjörn eriksson.

  1. 6. Rekonstruktion av logaritmer med tallinjer som medierande redskap

    Författare :Roger Fermsjö; Torbjörn Tambour; Inger Eriksson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Logarithms; Napier; Davydov; learning activity; learning action; learning tasks; mediated tool; learning study;

    Sammanfattning : The aim of the research reported in this licentiate thesis was to create an environment that could support students’ learning about logarithms. To develop such a learning environment, Davydov’s ‘learning activity’ was used as a theoretical framework for the design. LÄS MER

  3. 7. Syntheses, structure determination, magnetic and thermoelectric properties of quasicrystal approximants in RE-Au-SM systems (RE = Gd, Tb and Yb and SM = Si, Ge)

    Författare :Girma Hailu Gebresenbut; Cesar Gomez; Martin Sahlberg; Torbjörn Gustafsson; Lars Eriksson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quasicrystals; quasicrystal approximants; thermoelectric properties; magnetic properties; Materialvetenskap; Materials Science;

    Sammanfattning : In this study, new compositions of Tsai-type 1/1 quasicrystal approximants Gd(14)Au(70)Si(16), Gd(14)Au(67)Ge(19), Tb(14)Au(70)Si(16) and Yb(16)Au(65)Ge(19)are synthesized using both self-flux and arc-melting-annealing techniques. Both syntheses routes resulted single phase samples. LÄS MER

  4. 8. Influence of defects and impurities on the properties of 2D materials

    Författare :Soumyajyoti Haldar; Biplab Sanyal; Olle Eriksson; Torbjörn Björkman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 2D Materials; Defects on 2D materials; Impurities on 2D materials; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Graphene, the thinnest material with a stable 2D structure, is a potential alternative for silicon-based electronics. However, zero band gap of graphene causes a poor on-off ratio of current thus making it unsuitable for logic operations. This problem prompted scientists to find other suitable 2D materials. LÄS MER

  5. 9. Children with juvenile idiopathic arthritis : health-related quality of life and participation in healthcare encounters

    Författare :Veronica Lundberg; Anncristine Fjellman-Wiklund; Catharina Eriksson; Torbjörn Lind; Rebecka Janols; Eva Broström; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Child; Gender; Healthcare professionals; Health-related quality of life; Informant discrepancies; Juvenile Idiopathic Arthritis; Parents; Participation; Pediatrics; Qualitative; Questionnaire; pediatrik; Pediatrics;

    Sammanfattning : Background: Growing up with Juvenile Idiopathic Arthritis (JIA) can be associated with functional limitations, feelings of being different, and an impaired health-related quality of life (HRQOL). Children’s and parents’ reports of child HRQOL may differ. LÄS MER

  7. 10. Exploring magnetocaloric materials by ab-initio methods

    Författare :Rafael Martinho Vieira; Heike C. Herper; Torbjörn Björkman; Olle Eriksson; Markus Gruner; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetocaloric; magnetism; ab-initio;

    Sammanfattning : This thesis explores the characterization of magnetocaloric materials from first-principles calculations, emphasizing entropy variation associated with the magnetocaloric effect. The study happens in the context of the search for new magnetocaloric materials to be applied in domestic magnetic refrigerators,  as environmentally friendly and energy-efficient alternatives to conventional vapor-compression devices. LÄS MER